Question: When did the reign of Sigismund III Vasa as King of Poland end?
Paraphrase: Sigismund III Vasa was King of Poland, when did his reign end?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q52940 p:P39 ?s . ?s ps:P39 wd:Q3273712 . ?s pq:P582 ?value}